Mysteries of my subconscious

I was running down the street I live on from... I'm not totally sure. But I was running with a friend and my girlfriend. My girlfriend ran into a tree branch hanging over a wall and she just disappeared or something. I remember that happening in a dream of mine previously, so I immediately realized I was dreaming WITHOUT even trying to do a reality check. I just began to run a lot faster and leaped into the air and began to kind of soar through the air. I was only lucid for less than probably 10 seconds in my dream. I began flying, and not long afterwards I was flying (but having trouble) flying through the small, crowded casino. I saw a friend of mine and tried to show off to him what I could do and then my dream cut out.